Acquisitions Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Mar. 31, 2016	Feb. 18, 2016	Feb. 29, 2016	Feb. 29, 2016	Feb. 28, 2015	Feb. 17, 2016
Business Acquisition [Line Items]
Business acquisition				$ 7,210
Payments to Acquire Businesses, Net of Cash Acquired				$ 15,026	$ 0
Larzep
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill						$ 5,332
Business acquisition			$ 7,210
Supplemental Deferred Purchase Price		$ 1,500
Payments to Acquire Businesses, Net of Cash Acquired		$ 14,600
Business Acquisition, Effective Date of Acquisition		Feb. 17, 2016
Tradenames | Larzep
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill						1,900
Customer relationships | Larzep
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill						$ 3,400
Subsequent Event | FourQuest
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 64,300